28149764 has 12 divisors (see below), whose sum is σ = 49468188. Its totient is φ = 14016000.

The previous prime is 28149761. The next prime is 28149809. The reversal of 28149764 is 46794182.

It can be written as a sum of positive squares in 2 ways, for example, as 15132100 + 13017664 = 3890^2 + 3608^2 .

It is not an unprimeable number, because it can be changed into a prime (28149761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13637 + ... + 15564.

It is an arithmetic number, because the mean of its divisors is an integer number (4122349).

Almost surely, 2^28149764 is an apocalyptic number.

It is an amenable number.

28149764 is a deficient number, since it is larger than the sum of its proper divisors (21318424).

28149764 is a wasteful number, since it uses less digits than its factorization.

28149764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29446 (or 29444 counting only the distinct ones).

The product of its digits is 96768, while the sum is 41.

The square root of 28149764 is about 5305.6351174954. The cubic root of 28149764 is about 304.1993296839.

The spelling of 28149764 in words is "twenty-eight million, one hundred forty-nine thousand, seven hundred sixty-four".